setup octodns for automatic dns records

hosts/freun-dev/configuration.nix

@@ -3,7 +3,10 @@
 # and in the NixOS manual (accessible by running `nixos-help`).
 
 { config, pkgs, ssh, ... }:
-
+let
+  ipv4Address = "65.21.145.150";
+  ipv6Address = "2a01:4f9:c011:9ac1::1";
+in
 {
   nix = {
     settings = {
@@ -25,13 +28,24 @@
   networking.useDHCP = false;
   networking.nftables.enable = true;
 
+  services.octodns.records."" = {
+    A = {
+      ttl = 86400;
+      values = [ ipv4Address ];
+    };
+    AAAA = {
+      ttl = 86400;
+      values = [ ipv6Address ];
+    };
+  };
+
   systemd.network = {
     enable = true;
     networks.static = {
       name = "enp1s0";
       address = [
-        "65.21.145.150/32"
-        "2a01:4f9:c011:9ac1::1/64"
+        "${ipv4Address}/32"
+        "${ipv6Address}/64"
       ];
       routes = [
         { Gateway = "fe80::1"; }